Valve.



E. M. SCOVILLE.

VALVE.

APPLICATION FILED DEC.26. I914.

r Patented Nov. 23, 1915.

barren smarts a rest amp. I

EUGENE M. scovILLE, or warranu, mnnnrronv or HAWAII.

vary n.

To all whom it may concern:

Be it known that T, EUGENE M. ScovILLn,

a citizen of the United States, residing at which it appertains to make and use the same.

Thls invention relates to improvements 1n valves, and is particularly applicable to pump valves.

The ideal valve, especially for high pressure pumps, is unquestionably one which seats metal to metal, provided that it can be kept tight with a minimum of trouble and expense.

Valves which depend for their tightness upon a seat of compressible material in conjunction with a pressure exerted upon the valve proper to force it to a tight contact with the compressible seat, are necessarily short lived, and particularly so when working under high pressures and at high speeds. Valves in Which a flexible material, such as leather, is attached to the valve proper, for the purpose of sealing the valve, are objectionable, for the upward flow of the fluid discharged through the valve is more or less obstructed thereby and the life of such material is short. 7

. The present invention contemplates a valve which seats metal to metal and is not dependent upon the pressure on the valve proper for its tightness and effectiveness. It is provided with a ring or rings of easily compressible material, such vas soft rubber for example, inserted in a groove or grooves in the valve'casing contiguous to the seat or seats. The edge or edges of the valve proper are beveled and come in fairly close contact with the ring or rings when the valve is seated. lf'there is any tendency to leak, due for example to an imperfect fit ora damaged seat, the action of the fluid in attempting to escape through the'same forces the ring into the V-shaped groove, formed by the junction of the beveled edge of the valve with the top of the casing adjacent to the seat, and thereby seals the. joint. The beveling of the valve also gives the advantage of offering less obstruction to the upward flow of the fluid when leaving the valve. This is of considerable importance,

especially so when the valves are set closely together. JViththe ordinary type of valve the fluid is deflected by the valve itself and 1s discharged against the fiuid'dis'charged trom the adjacent valves, which causes the formation of objectionable eddies and impedes the upward fiowof the fluid.

The invention comprises, therefore, a valve having a metal casing, a metal valve slidable on a stud or stem in the casing, a spr ngadapted to force the valve toward the cas ng, said valve adapted to seat on the casing metal to metal and having a beveled edge, and a ring of compressible material 1n a groove in the casing adjacent to and surrounding the seat and adapted to be forced by the pressure of the fluid against the beveled edge of the valve when the fluid attempts to escape through the joint between the valve and the seat, and thereby seal the oint. To prevent a leak between the valve and the stem, the valve may also seat against the casing metal to metal around the stem and be beveled adjacent'to the stem, and a ring of compressible material be inserted in a groove in the casing surrounding the stem adapted to be forced against the. beveled the beveled edge of the valve and the ring.

As the valve thus seats metal to metal on the body or casing and not on the compressible ring or rings, the beveled edge or edges of the valve proper only coming in fairly close contact with the ring br rings, there is very little wear on the latter, and incase of renewalthey are easily and cheaply replaced. Valves of the construction contemplated are, therefore, not dependent upon the pressure on the valve proper for their tightness'and effectiveness.

The accompanying drawing, forming a part ofthis specification, is a sectional view through the middle of a pump valve embodying a preferred form of my invention.

seat 1 of the hub 1 The spring 4, interposed between the valve 3 and the nut 5 on the stem 2, forces the valve 3 towardthe easing 1. The valve 3 is beveled at its outer edge 3 and also at its inner edge 3 near the stem 2, as shown. The ring 6, of soft rubber or other compressible material, is inserted in and projects above the groove l adjacent to the seat l and surrounding the same. The ring 7 is similarly inserted in the groove 1? in the hub 1 of the casing l and surrounds the stem 2, as shown.

In practice, valves of this construction,-

having four rings each, have been in contmuous operation in a Riedler pump for seve'ral months working night and day against a pressure of two hundred and twenty-five pounds per square inch, opening onan average of sixty times per minute, and are abso lutely tight and eflicient.

It is obvious that the construction could be reversed from'that described, by beveling the casing instead of the valve and inserting the ring in a groove in the valve instead of in the casing, but such an arrangement is not desirable, one reason being that the discharge upward of the fluid is obstructed due to the increased size of the valve proper which is necessary in order to provide the groove for the ring.

I claim:

1. A valve comprising, a metal casing provided With a stem, a metal valve slidable on the stem, said valve adapted to seat on the casing metal to metal and provided with a beveled edge, and a ring of compressible material in a groove in the casing adjacent to and surrounding the seat but so positioned as not to be compressed by the valve, said ring of compressible material adapted to be forced by the pressure of the fluid against the beveled edge of the valve when the fluid attempts to escape through the joint between the seat and the valve, for the purpose described.

2. A valve comprising a valve seat and a valve adapted to seat directly on said seat, said seat having a circular recess adjacent to the valve, and a ring of compressible material positioned in said recess and adapted to be forced by'the pressure of the fluid against an adjacent surface of the valve when the fluid attempts to escape by the valve but so positioned that it will not be compressed by the valve itself.

3. A valve comprising a valve seat and a valve adapted to seat directly on said seat and having a beveled edge, a gasket of compressible material associated with said seat and adapted to be forced by the pressure of the fluid against said beveled edge of the valve but so positioned that, it will not be compressed by the valve itself.

In testimony whereof I afiix my signature, in presence of two witnesses.

EUGENE M. sooviLLE.

\Vitnesses:

W. E. James, RoBT. J. Pnar'r. 

